I'd draw directly onto the tabletop with a scribe compass and then cut it with a jigsaw with a quality blade. Or do it on a scrap piece of ply first, cut it out, make sure it fits perfectly and then transfer to the tabletop and jigsaw away.
I keep reading that jigsaws will inevitably wander on a thick piece of solid worktop though - is that not your experience?
Haven't had that problem no. Thickest I've done has been 35mm oak.
Yes, I don't find jigsaws cope well with 40mm hardwood worktop. i would make a template and use a router.
@Stevethecoffee started
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I'd draw directly onto the tabletop with a scribe compass and then cut it with a jigsaw with a quality blade. Or do it on a scrap piece of ply first, cut it out, make sure it fits perfectly and then transfer to the tabletop and jigsaw away.